A 24-year-old man in Orleans Parish Prison, accused of slashing a woman's throat, is so paranoid and delusional he believes that his own defense attorney is conspiring to kill him, a doctor testified Thursday. Tomarcus Porter, an Arkansas native, was ruled incompetent to stand trial on a charge of second-degree murder.

The doctor said it was "an urgent matter" to get him to a maximum-security mental health facility as soon as possible.

Porter is accused of killing 47-year-old Gisela Graeble-Dagmer, whose body was found alongside the Municipal Auditorium in Armstrong Park in August 2011. Her throat had been cut.

Graeble-Dagmar, a German national who lived in Florida, was in town for about three weeks visiting a male friend. The couple got into an argument and Graeble-Dagmar reportedly met Porter while looking for a new place to stay.

She was last seen holding a suitcase at North Rampart and Toulouse streets, across from the park, around 10:30 p.m. on Aug. 7, 2011. Someone saw the pair walking down Basin Street.

Four days later, a man walking his dog discovered her decomposing body in the shrubs next to the auditorium, near where they had been seen together.

Porter's DNA was found underneath her fingernails, and police had a description of the person last seen with her.

An officer on patrol Aug. 13 spotted someone who matched that description, near the corner where she disappeared. That man, identified as Porter, ran, pulled a pellet gun from his waistband and pointed it at the officer, according to a police report. He was soon captured, and charged with the murder and aggravated assault for allegedly pulling the gun on the officer.

Porter's public defender, Scott Sherman, told the judge Thursday that his client was "highly agitated" and could not come to court.

Dr. Nicolas Vergara, a forensic psychiatrist fellow at Tulane University, said Porter is paranoid and delusional, leading him to become combative and "extremely violent."

Porter reportedly told the doctor that he believes that Sherman, his attorney, is involved in a plot to kill him.

Vergara, part of a court-appointed panel tasked with determining Porter's competency, recommended that he be found incompetent to stand trial, because his mental illness renders him unable to understand the proceedings against him. Both other members of the panel agreed.

He described it as an urgent priority that Porter be sent for treatment at the maximum-security ward at Eastern Louisiana Mental Health System.

The judge obliged, and scheduled Porter to return to court in June to be reevaluated for competency.

Assistant District Attorney John Alford attempted to ask the doctor questions, but Willard interrupted and forbade him from questioning the doctor.

Alford objected, and said he intended to request that the 4th Circuit Court of Appeal review the judge's decision barring him from cross-examining a witness.

Porter, meanwhile, should be transported soon to East Feliciana Parish for treatment.